For future reference, it can be easily copied by searching on Wikipedia for <a href="http://en.wikipedia.org/wiki/Acute_accent">acute accent</a> or <a href="http://en.wikipedia.org/wiki/Cliche">cliche</a>. Shame.

Often, literally, a pillow fight but may include similar situations like volleyball, particularly when wardrobe is skimpy and the action is bouncy.